Ya, it's going to suck when me and the 15 or so other guildies all ding 85, what will we do?!? I mean, besides start working on getting gear in the new dungeons.
Have fun slowly leveling in the Zone you've been in for 9 hours straight, I'm sure you'll find new trees to look at. Me on the other hand, I'll actually be enjoying new dungeons and learning new boss fights. But you have fun kill "Mob Z" for the 30th time waiting for him to drop a key.